This set of posts comes from Pastor Mark Driscoll and his wife Grace. The sermon series The Peasant Princess brought up dozens of questions that they felt they should respond to. The result is this blog series: Christian Sex: Frank Answers to Honest Questions.
Answer:
To motivate them toward growing up and honorably taking a wife. Nearly every man wants to have sex. The issue is which woman he will have sex with. If he grows up, leaves home, walks with God, pursues his career, and then marries his bride to enjoy her biblically, then his love for her was part of God's motivation to turn a boy into a man by making him take manly responsibility. Since most young men want sex, that desire is to encourage them to not settle for having sex with their hand or with their girlfriend, but rather grow up and lovingly enjoy their wife.
